Machine for making spools or bobbins



April 8, 1930- E. SCHWEIZER 1,753,628

` MACHINE FOR MAKING SPOOLS OR BOBBINS Filved July '7, 1926 -UNITED STA Patented Apr. 8, 1930- TES j ERNST SCHWEIZER, or EASEL, SWITZERLAND j MACHINE Eon MAKING srooLs Von EoBBINs Application ined July 7, 192s, serial no.j'1e1,o2o, airain Yswitzeimna Jiuyn, 1925'.v j

This inventionr'elates to a machine for the manufacture of wooden spools from wooden rods of the kind in which the rod which is held in a rotataing hollow shaft is drilled by a drilling device and a rotatable tool is fed forward to the work automatically in a positive sequence for the purpose of machining the work and severingit from the rod.

*According to the known `machines of this type, the tools for making the profile ofthe spool consist of profile cutters, which for the purpose of making the profile only approach the axis of the work piece or blank but do not make any further movement. It has however been found'that the firmness of the material, o fwhich such spools consist, `can not withstand the'pressure of the profile cutters, which acts on the entire length ofthe work piece or blank and that during the lworking or machining operation, the spool frequently breaks at its clamped end. l If the drill for making the central; bore of the spool alsoserves for centering the work piece or blankV when the profileV isymade, thel drill may easily break because it is also subjected to flexur f According to the ginventiornthese disadvantages or drawbacks are obviatedv in that the spoolV prole isinade by a narrow cutter disc, .thethickness of which amounts to only a slight Afraction' of the length ofthe `spool and which cutter disc, when makingthe spool profile, isfirst guided obliquelyl to the axis of the spool in order to make the'fiange, then moves parallel to theY axis of the spool in order to form the spool body, whereupon'it is. returned again obliquelyto the axis of the spool in order to makethe second flange. The narrow cutter discexerts on the workpiece or blank much less'pressure than the known profile, cutters, which simultaneously produce the entire profile. Owing to constant movement of the prolilecutter parallel to the axis ofthe workpiece or blank, a large amount of the exerted pressure forms a component which extends parallel to the axis of the workpiece or blankand the latter is not subjected to flexure but onlyvto nondetri- ,mental pressure in the direction of the fiber.

`The pressure exerted by a cutter disc, accord;

ing to'the'in'vention, transversely to the axis ofthe workpiece or blank, is therefore conslderably less thanwouvld correspond to the lreduction of the ratiov vbetween the spool length and the tool width. p 4 v The movement or displacement of the cutter disc is preferablyeected by vmounting vthe cutter discv on slides and lcontrolling the Vworkpiece or blank at the beginning of the operation and is again withdrawn therefrom atthe end of the operation in order to make the inclined flange I "i Thelinvention will now be described in `detail with referencer to the' accompanying drawings, vin which: 1

`YFigure 1 shows ka machine in elevation, while l l c Figure 2 is acorresponding plan, andA y Figure 3 an end `elevation partly in section III-AHI, Fig. 1. l

Figure 4 shows a spool manufactured on thek machine.

Referring now to the drawings, and first Vto Figs. 1 to'3, 37 is the frame of the machine,

k38 is its foundation plate, 1 is a hollow-feed shaft for the reception of the rod a, 39, 40 are bearings for the hollow"shaft, 2 isa `pulley on the hollow shaft,and 41 is va beltron the pulley. 4la isa chuck at the end of the hollow sha-ft by which-the rod a is clamped while being machined, as will be described, 3 is the main shaft which-'is carried in suitable bearings inthe frame of the machine, 43, 30, 11, c, 13, 17, and 22 are cam plates on thevshaft, 42 is a'worm wheel on the shaft, 5 is a worm meshing with the wheel 42, and 4 is a step pulley on the shaft of the worm.

y 35 is a rocking lever by which the chuck 1a is controlled yfr'omthe cam 43.

, 44 is a dove-tailed guide extending across the Vframe 37 near its rear end, 7 a is a carriage onthe guide 44, 19 isa rocking lever extending from cam 13, the edge of which is partly concentric, to 'the carriage 7a so that the car- I'iage is moved while the lever 19 is on the fso cammed part of the plate 13, and 7b and 14b are tool slides fitted to move along guides and 46 which are formed on the carriage 7a in parallel relation with the axis of the machine. 7 is a bar secured to the outer edge of the slide 7', with a slotted eye at one end, 12

is a rocking lever cooperating with cam plate 11, and 7 d is a pin at the end of the lever which engages the eye of the bar 7C. 36 is a pullback spring engaging the lever 12. 10 is a pin at the rear end of the slide 7b, which leX- tends through a slot in the carriage 7 a, 47 is a shoe fitted to the lower end` of the pin 1t), 9 is a former which is fulcrumed onthe frame 37 and is 'adapted to be engaged bythe shoe 47 at its edge, and .Saisascrewfor adjusting the former 9. Y 18 is a rocking lever by which the slide 14b andthe cam 17 are operatively connected, the lever being only partly visible in Fig. l.

` 51 is a drill rod which is mounted torotate and to slide in bearings 48 and 49 which extend upwards from the frame 37, thecarriage 7 a beingslotted at 50 for the accommodation of the front bearing 48; 152 is a chuck on the free end of the rod, and 20 is a'drillin the chuck. Rotation is imparted tothe drill rod by a belt 52 on a pulley 53. The-drill rod rotates in opposite direction to that in which the hollow shaft 1 rotates. l21 is a rocking lever operatively connected with4 thej cam plate 22 and abutting on .the rod 51 with its upper end so as to displace said rod against the action of a spring 54. g y j` 8, 15, and 16 are milling cutters lmounted to rotate on the slides 7 a and 14h, respectively, with pulleys 55V and'56 on the respective cutter shafts. 24 is a cutting-ofi'tool-attheiend of a rocking lever 25 which is -fulc-rumed at the upper end of an upright 58 at-57', 26iisa link, and 27 is a lever through which` the lever 25 is rocked from the cam plate 3,0.

-59 `is a rod,with a stop bat its-upper end for arresting the rod a while thespool is'being tooled. The rod 59 cooperates with the camplate c.

Y Rotation 1s imparted to the cutting-olf tool 24 by a belt 62 on a pulley-33 at the end of a shaft which is mounted to rotate inV an lextension of the bearing 49, 61 is a ball-joint at the inner end. of the shaft, 60 is a balljoint at the end ofthe shaft on whichthe tool 24 is secured, and 32 is a shaft connecting the two ball joints. l

The-method of working of the machine is as follows:

After the rod a is pushedup to the stop b,

the lclamping chuck v1a controlled by a controlling lever 35i-comes into operation and clamps the work fast. Thereupon the Vstop b, `under the action of the cam plate c, is drawn downwards and the rotating drill 20 Vproduces the central hole in the spool by being forced ka number of times into the rod.

' Thereupon, the slides 7 a and 7 b rwith the milling cutter 8 are guided up to the work, the slide 7b being shifted in an oblique direction by means of the parts 9, 10, during the forward feed of the slide 7 a, so that the milling cutter 8 mills out the oblique surface :v at

spool trunk y. While the longitudinal displacement'of the slide 7b still continues, the slide 7 a begins its .return movement, whereby the milling cutter 8 moves alon an oblique path and mills the inclined ,surace Iz. at the other headend of the spool body, whereupon the lever 12 is relieved of they pressure of `the cam pla-te 11 and under theyaction ofthe spring 36 returns the slide 7b idly towards the initial position. During thevreturn movement of the lower slide 7a- .and the milling cutter 8,.A i. e. during the milling of the surface e, the upper slide 14b resting on the common lower .slide 7 a, together with the-two milling cutters 15, 16 is moved towards the work. As 4soon as `the slide 7 b, Aafter the surface e lhasbeen finished, moves rearwardly stillfurther, the milling cutters 15, 16., under the action of thecam plate 17 begin to mill Vaway `at the peripheries Vof the head ends of the spool body, until nally they are retractedjby shifting the slide 14'-baek into the inoperative' position.

As a last .step the Cam platet()V comes'into fractureor displacement 4of the workffrom' i its initial position under the action .of the milling cutter pressure is avoided. r

Having' ,-now particularly l 'described and ascertained the nature of `my -sai-d invention and inwhat manner the'same is to be performed, I decl-are that whatI claim is:

1. A machine for making wooden spools from a rod, `having a rotating hollow shaft, means for clamping a rod therein, a rotating drill for drilling said rod, a narrow disc cutter, whereby .only .a fraction `of the surface to be worked upon comes in Contact with the cutter, and means for -guiding said cutter both obliquely and parallel to the axis of workpiece. f

2. AV machine-for making wooden `spools from a rod, having a rotating hollow shaft, means for clamping a rod therein, a rotating drill for drilling said rod, a carriage, means for moving said carriage across said machine, a slide `on saidv carriage, a rotary narrow disc cutter on said slide, and means Afor moving said slide at an angle to, and in parallel relation with, the axis of said hollow shaft.

3. A machine for making wooden spools from a rod, having a rotating hollow shaft, means for clamping a rod therein, a rotating drill for drilling said rod, a carriage, means for moving said carriage across said machine, slides on said carriage at either side of the Y axis of said hollow shaft, narrow disc cutters lo on said slides, means for moving one of said slides at an angle to, and in parallel relation with, the axis of said hollow shaft, and means for moving said other slide in parallel rela-y tion with said axis.

V 4. A machine for making wooden spools from a rod, havinga rotating hollow shaft, means for clamping a rod therein, a rotating drill for drilling said rod, a narrow disc cutter whereby only a fraction of the surface to be worked upon comes in contact with the cutter, means for guiding said cutter both obliquely and parallel to the axis of said workpiece, and means for cutting off the finished spool from said rod.

In testimony whereof I aiiix my signature.

ERNST SCHVEIZER. 

